Definition of minnesotaite in English:

minnesotaite

Pronunciation /ˌmɪnɪˈsəʊtəˌʌɪt/

noun

Mineralogy
  • A silicate of iron and magnesium, (Fe,Mg)₃ Si₄ O₁₀ (OH)₂ crystallizing in the triclinic system and occurring as dull or waxy greenish-grey plates or needles.

Origin

1940s. From the name of Minnesota + -ite.